Last night hooked up a new Roku Express 4K+ (Serial # SO7P22365TVU) to replace a Roku stick as remote was wearing out. After finally completing setup there is roughly six inches of blank screen on left and right sides of tv. Have spent hours on the web trying to find a solution without success. The picture seems fine; just not a full screen. Any help will be greatly appreciated.
See if your TV itself has some picture size control that adjusts this.